Windows command reference
Reliability Monitor
Open Reliability Monitor to review a time-oriented history of Windows reliability events and repeated application/system failures.
Risk: LowReviewed: 2026-09-17
perfmon /relWhen to use it
Use when you need to identify when crashes began and correlate them with application, driver or Windows changes.
When not to use it
Do not treat the stability index or a single red failure as proof of the root cause; verify the event/application details in the matching subsystem.
Primary reference